elf.c File Reference

(7c4d7d1 userspace/term: change eyecandy inclusion to use objcopy instead of xxd)

#include "elf.h"
#include "log.h"
#include "string.h"
#include "mm.h"
#include "vm.h"

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Data Structures
struct	Symbol
struct	SymbolData

Functions
ptr_t	load_elf (ptr_t start, struct vm_table *context, ptr_t *data_start, ptr_t *data_end)
elf_section_header_t *	elf_section_by_name (const char *name, const void *elf)
void *	elf_load_symbols (ptr_t elf, allocator_t *alloc)
bool	elf_symbolize (void *symbol_data, ptr_t addr, size_t *symbol_size, char *symbol)

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Data Structure Documentation

Symbol

struct Symbol

Definition at line 89 of file elf.c.

Collaboration diagram for Symbol:

Data Fields
uint64_t	address
uint32_t	name

SymbolData

struct SymbolData

Definition at line 94 of file elf.c.

Collaboration diagram for SymbolData:

Data Fields
allocator_t *	alloc
uint64_t	numSymbols
char *	symbolNames
struct Symbol	symbols[0]

Function Documentation

elf_load_symbols()

void * elf_load_symbols	(	ptr_t	elf,
		allocator_t *	alloc
	)

Load symbols of the provided ELF file.

Parameters

elf	ELF file already loaded into memory
alloc	Allocator to use for dynamically allocating memory

Returns

Pointer to a opaque data structure containing the symbols, use elf_symbolize to retrieve the symbol for a given address

Definition at line 101 of file elf.c.

References elf_symbol::addr, Symbol::address, allocator::alloc, alloc, elf_section_by_name(), elf_section_header::entrySize, header, logw, memcpy(), Symbol::name, elf_symbol::name, SymbolData::numSymbols, elf_section_header::offset, and elf_section_header::size.

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elf_section_by_name()

elf_section_header_t * elf_section_by_name	(	const char *	name,
		const void *	elf
	)

Return section header of ELF file by name

Parameters

name	Name of the section to return
elf	Loaded ELF image in memory

Returns

Pointer to elf_section_header_t if found, NULL otherwise

Definition at line 71 of file elf.c.

References name, elf_section_header::name, elf_section_header::offset, elf_file_header::sectionHeaderCount, elf_file_header::sectionHeaderEntrySize, elf_file_header::sectionHeaderOffset, elf_file_header::sectionHeaderSectionNameIndex, and strcmp().

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elf_symbolize()

bool elf_symbolize	(	void *	symbols,
		ptr_t	addr,
		size_t *	symbol_length,
		char *	symbol
	)

Get the symbol name (and offset) for a given address from the data loaded with elf_load_symbols.

Parameters

symbols	Opaque data structure returned by elf_load_symbols
addr	Address to symbolize
symbol_length	Input for size of the buffer where to write symbol, output actual size of either the data written into the buffer or the size needed for the buffer
symbol	Output buffer where to write the symbol

Returns

true if a symbol was found and the output buffer had enough space, false if no symbol was found or output buffer was too small. Output buffer to small can be recognized by symbol_length being set to a non-zero value.

Definition at line 133 of file elf.c.

References addr, Symbol::address, ksnprintf(), Symbol::name, SymbolData::numSymbols, strlen(), strncpy(), SymbolData::symbolNames, and SymbolData::symbols.

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load_elf()

ptr_t load_elf	(	ptr_t	elf,
		struct vm_table *	context,
		ptr_t *	data_start,
		ptr_t *	data_end
	)

Parse ELF file, map program segments to context and return proper location for stack.

Parameters

[in]	elf	Memory chunk where the ELF file is loaded.
[in]	context	VM context for mapping of program segments.
[out]	data_start	Start of the data section
[out]	data_end	End of the data section

Returns

Entrypoint of the image

Definition at line 7 of file elf.c.

References ALLOCATOR_REGION_DIRECT_MAPPING, data_end, ELF_MAGIC, fileLength, elf_program_header::fileLength, header, logf, memcpy(), elf_program_header::memLength, memset(), mm_alloc_pages(), offset, elf_program_header::offset, elf_program_header::type, elf_program_header::vaddr, and vm_context_map().

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